
	/*
	 *  在jquery.suggest 1.1基础上针对中文输入的特点做了部分修改，下载原版请到jquery插件库
	 *  修改者：wangshuai
	 *
	 *  修改部分已在文中标注
	 *
	 *
	 *	jquery.suggest 1.1 - 2007-08-06
	 *
	 *	Uses code and techniques from following libraries:
	 *	1. http://www.dyve.net/jquery/?autocomplete
	 *	2. http://dev.jquery.com/browser/trunk/plugins/interface/iautocompleter.js
	 *
	 *	All the new stuff written by Peter Vulgaris(www.vulgarisoip.com)
	 *	Feel free to do whatever you want with this file
	 *
	 */

	(function($) {

		$.suggest = function(input, options) {

			var $input = $(input).attr("autocomplete", "off");
			var $results = $(document.createElement("ul"));

			var timeout = false;		// hold timeout ID for suggestion results to appear
			var prevLength = 0;			// last recorded length of $input.val()
			var cache = [];				// cache MRU list
			var cacheSize = 0;			// size of cache in chars(bytes?)

			$results.addClass(options.resultsClass).appendTo('body');


			resetPosition();
			$(window)
				.load(resetPosition)		// just in case user is changing size of page while loading
				.resize(resetPosition);

			$input.blur(function() {
				setTimeout(function() { $results.hide() }, 200);
			});


			// help IE users if possible
			try {
				$results.bgiframe();
			} catch(e) { }


			// I really hate browser detection, but I don't see any other way

//修改开始
//下面部分在作者原来代码的基本上针对中文输入的特点做了些修改
			if($.browser.mozilla)
				$input.keypress(processKey2);	// onkeypress repeats arrow keys in Mozilla/Opera
			else
				$input.keydown(processKey2);		// onkeydown repeats arrow keys in IE/Safari*/
			//这里是自己改为keyup事件
			$input.keyup(processKey);
//修改结束


			function resetPosition() {
				// requires jquery.dimension plugin
				var offset = $input.offset();
				$results.css({
					top: (offset.top + $input.outerHeight()) + 'px',
					left: offset.left + 'px'
				});
			}

			function processKey(e) {

				// handling up/down/escape requires results to be visible
				// handling enter/tab requires that AND a result to be selected
				if(/^32$|^9$/.test(e.keyCode) && getCurrentResult()) {

		            if(e.preventDefault)
		                e.preventDefault();
					if(e.stopPropagation)
		                e.stopPropagation();

	                e.cancelBubble = true;
	                e.returnValue = false;
					selectCurrentResult();

				} else if($input.val().length != prevLength) {

					if(timeout)
						clearTimeout(timeout);
					timeout = setTimeout(suggest, options.delay);
					prevLength = $input.val().length;

				}


			}
//此处针对上面介绍的修改增加的函数
			function processKey2(e) {

				// handling up/down/escape requires results to be visible
				// handling enter/tab requires that AND a result to be selected
				if(/27$|38$|40$/.test(e.keyCode) && $results.is(':visible')) {

		            if(e.preventDefault)
		                e.preventDefault();
					if(e.stopPropagation)
		                e.stopPropagation();

	                e.cancelBubble = true;
	                e.returnValue = false;
					switch(e.keyCode) {

						case 38: // up
							prevResult();z
							break;

						case 40: // down
							nextResult();
							break;

						case 27: //	escape
							$results.hide();
							break;

					}

				} else if($input.val().length != prevLength) {

					if(timeout)
						clearTimeout(timeout);
					timeout = setTimeout(suggest, options.delay);
					prevLength = $input.val().length;

				}
			}


			function suggest() {

				var q = $.trim($input.val());

				if(q.length >= options.minchars) {

					cached = checkCache(q);

					if(cached) {

						displayItems(cached['items']);

					} else {
						// Add by Leo
						var params = {q: q};
						if(options.params != undefined){
							for(var x in options.params){
								params[x] = options.params[x];
							}
						}
						if(options.htmlIds != undefined){
							for(var x in options.htmlIds){
								params[options.htmlIds[x]] = $('#'+options.htmlIds[x]).val();
							}
						}

						$.get(options.source, params, function(txt) {

							$results.hide();

							var items = parseTxt(txt, q);

							displayItems(items);
							addToCache(q, items, txt.length);

						});

					}

				} else {

					$results.hide();

				}

			}


			function checkCache(q) {

				for(var i = 0; i < cache.length; i++)
					if(cache[i]['q'] == q) {
						cache.unshift(cache.splice(i, 1)[0]);
						return cache[0];
					}

				return false;

			}

			function addToCache(q, items, size) {

				while(cache.length && (cacheSize + size > options.maxCacheSize)) {
					var cached = cache.pop();
					cacheSize -= cached['size'];
				}

				cache.push({
					q: q,
					size: size,
					items: items
					});

				cacheSize += size;

			}

			function displayItems(items) {

				if(!items)
					return;

				if(!items.length) {
					$results.hide();
					return;
				}

				var html = '';
				for(var i = 0; i < items.length; i++)
					html += '<li>' + items[i] + '</li>';

				$results.html(html).show();

				$results
					.children('li')
					.mouseover(function() {
						$results.children('li').removeClass(options.selectClass);
						$(this).addClass(options.selectClass);
					})
					.click(function(e) {
						e.preventDefault();
						e.stopPropagation();
						selectCurrentResult();
					});

			}

			function parseTxt(txt, q) {

				var items = [];
				var tokens = txt.split(options.delimiter);

				// parse returned data for non-empty items
				for(var i = 0; i < tokens.length; i++) {
					var token = $.trim(tokens[i]);
					if(token) {
						token = token.replace(
							new RegExp(q, 'ig'),
							function(q) { return '<span class="' + options.matchClass + '">' + q + '</span>' }
							);
						items[items.length] = token;
					}
				}

				return items;
			}

			function getCurrentResult() {

				if(!$results.is(':visible'))
					return false;

				var $currentResult = $results.children('li.' + options.selectClass);

				if(!$currentResult.length)
					$currentResult = false;

				return $currentResult;

			}

			function selectCurrentResult() {

				$currentResult = getCurrentResult();

				if($currentResult) {
					$input.val($currentResult.text());
					$results.hide();

					if(options.onSelect)
						options.onSelect.apply($input[0]);

				}

			}

			function nextResult() {

				$currentResult = getCurrentResult();

				if($currentResult)
					$currentResult
						.removeClass(options.selectClass)
						.next()
							.addClass(options.selectClass);
				else
					$results.children('li:first-child').addClass(options.selectClass);

			}

			function prevResult() {

				$currentResult = getCurrentResult();

				if($currentResult)
					$currentResult
						.removeClass(options.selectClass)
						.prev()
							.addClass(options.selectClass);
				else
					$results.children('li:last-child').addClass(options.selectClass);

			}

		}

		$.fn.suggest = function(source, options) {

			if(!source)
				return;

			options = options || {};
			options.source = source;
			options.delay = options.delay || 100;
			options.resultsClass = options.resultsClass || 'ac_results';
			options.selectClass = options.selectClass || 'ac_over';
			options.matchClass = options.matchClass || 'ac_match';
			options.minchars = options.minchars || 1;
			options.delimiter = options.delimiter || '\n';
			options.onSelect = options.onSelect || false;
			options.maxCacheSize = options.maxCacheSize || 65536;

			this.each(function() {
				new $.suggest(this, options);
			});

			return this;

		};

	})(jQuery);

